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https://www.readbyqxmd.com/read/28905239/expression-and-distribution-of-three-transient-receptor-potential-vanilloid-trpv-channel-proteins-in-human-odontoblast-like-cells
#1
Wen Wen, Kehua Que, Chengcheng Zang, Jing Wen, Guangxu Sun, Zhiying Zhao, Yanzhong Li
Odontoblasts have been suggested to contribute to nociceptive sensation in the tooth via expression of the transient receptor potential (TRP) channels. The TRP channels as a family of nonselective cation permeable channels play an important role in sensory transduction of human. In this study, we examined the expression of transient receptor potential vanilloid-1 (TRPV1), transient receptor potential vanilloid-2 (TRPV2) and transient receptor potential vanilloid-3 (TRPV3) channels in native human odontoblasts (HODs) and long-term cultured human dental pulp cells with odontoblast phenotyoe (LHOPs) obtained from healthy wisdom teeth with the use of immunohistochemistry (IHC), immunofluorescence (IF), quantitative real-time polymerase chain reaction (qRT-PCR),western blotting (WB) and immunoelectron microscopy (IEM) assay...
September 13, 2017: Journal of Molecular Histology
https://www.readbyqxmd.com/read/28903060/effects-of-curcumin-and-curcumin-analogues-on-trp-channels
#2
Marianna Nalli, Giorgio Ortar, Aniello Schiano Moriello, Vincenzo Di Marzo, Luciano De Petrocellis
A series of 33 curcumin analogues was synthesized and tested on TRPA1, TRPM8, and TRPV1 channels. Twenty of them acted as good modulators of TRPA1 channels. None was able to significantly activate TRPM8 channels, while curcumin itself and six curcuminoids belonging to the 1,3-dicarbonyl and acyclic series behaved as 'true' antagonists with IC50 values<5μM. Only few curcuminoids were able to modulate TRPV1 channels with EC50 and IC50 values ranging from 3.4 and 6.0μM.
September 10, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28900918/new-aspects-of-the-contribution-of-er-to-soce-regulation-trpc-proteins-as-a-link-between-plasma-membrane-ion-transport-and-intracellular-ca-2-stores
#3
Alexis Bavencoffe, Michael Xi Zhu, Jin-Bin Tian
Transient receptor potential canonical (TRPC) proteins were identified as molecular candidates of receptor- and/or store-operated channels because of their close homology to the Drosophila TRP and TRPL. Functional studies have revealed that TRPC channels play an integrated part of phospholipase C-transduced cell signaling, mediating the influx of both Ca(2+) and Na(+) into cells. As a consequence, the TRPC channels have diverse functional roles in different cell types, including metabotropic receptor-evoked membrane depolarization and intracellular Ca(2+) concentration elevation...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900915/stim-trp-pathways-and-microdomain-organization-auxiliary-proteins-of-the-stim-orai-complex
#4
Jonathan Pacheco, Luis Vaca
The basic paradigm of a mechanism for calcium influx triggered after a reduction on calcium store content implies a sensor of calcium concentration on the endoplasmic reticulum (the stores) and a calcium channel immersed on the plasma membrane. These two basic components are STIM and Orai, the most fundamental and minimal molecular constituents of the store-operated calcium entry mechanism. However, even when minimal components can be reduced to these two proteins, the intricate process involved in approximating two cellular membranes (endoplasmic reticulum, ER and plasma membrane, PM) require the participation of several other components, many of which remain unidentified to this date...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900914/stim-trp-pathways-and-microdomain-organization-contribution-of-trpc1-in-store-operated-ca-2-entry-impact-on-ca-2-signaling-and-cell-function
#5
Hwei Ling Ong, Indu S Ambudkar
Store-operated calcium entry (SOCE) is a ubiquitous Ca(2+) entry pathway that is activated in response to depletion of ER-Ca(2+) stores and critically controls the regulation of physiological functions in a wide variety of cell types. The transient receptor potential canonical (TRPC) channels (TRPCs 1-7), which are activated by stimuli leading to PIP2 hydrolysis, were first identified as molecular components of SOCE channels. While TRPC1 was associated with SOCE and regulation of function in several cell types, none of the TRPC members displayed I CRAC, the store-operated current identified in lymphocytes and mast cells...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900913/stim-trp-pathways-and-microdomain-organization-ca-2-influx-channels-the-orai-stim1-trpc-complexes
#6
Dora Bodnar, Woo Young Chung, Dongki Yang, Jeong Hee Hong, Archana Jha, Shmuel Muallem
Ca(2+) influx by plasma membrane Ca(2+) channels is the crucial component of the receptor-evoked Ca(2+) signal. The two main Ca(2+) influx channels of non-excitable cells are the Orai and TRPC families of Ca(2+) channels. These channels are activated in response to cell stimulation and Ca(2+) release from the endoplasmic reticulum (ER). The protein that conveys the Ca(2+) content of the ER to the plasma membrane is the ER Ca(2+) sensor STIM1. STIM1 activates the Orai channels and is obligatory for channel opening...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28899483/preparation-activity-and-structure-of-cross-linked-enzyme-aggregates-cleas-with-nanoparticle
#7
Shuguang Wang, Debing Zheng, Lingyu Yin, Fei Wang
Cross-linked enzyme aggregates (CLEAs) have emerged as an interesting biocatalyst design for enzyme immobilization. However, the commercialization of CLEAs is often hampered by their shortcomings, such as poor-controlled particle size, low activity and sticky characteristic. In order to overcome these drawbacks, five nanoparticles (NPs) (nano-TiO2, nano-MgO, nano-Ni, nano-Cu and nano-Fe3O4) were used to improve CLEAs activity and structure in this study. Results showed that moderate dosage of nano-TiO2 addition increased CLEAs activity, and the most increment was 15...
December 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28894590/trpa1-channel-mediates-organophosphate-induced-delayed-neuropathy
#8
Qiang Ding, Sui Fang, Xueqin Chen, Youxin Wang, Jian Li, Fuyun Tian, Xiang Xu, Bernard Attali, Xin Xie, Zhaobing Gao
The organophosphate-induced delayed neuropathy (OPIDN), often leads to paresthesias, ataxia and paralysis, occurs in the late-stage of acute poisoning or after repeated exposures to organophosphate (OP) insecticides or nerve agents, and may contribute to the Gulf War Syndrome. The acute phase of OP poisoning is often attributed to acetylcholinesterase inhibition. However, the underlying mechanism for the delayed neuropathy remains unknown and no treatment is available. Here we demonstrate that TRPA1 channel (Transient receptor potential cation channel, member A1) mediates OPIDN...
2017: Cell Discovery
https://www.readbyqxmd.com/read/28884838/review-article-transient-receptor-potential-channels-as-possible-therapeutic-targets-in-irritable-bowel-syndrome
#9
REVIEW
A B Beckers, Z Z R M Weerts, Z Helyes, A A M Masclee, D Keszthelyi
BACKGROUND: Abdominal pain in irritable bowel syndrome (IBS) remains challenging to treat effectively. Researchers have attempted to elucidate visceral nociceptive processes in order to guide treatment development. Transient receptor potential (TRP) channels have been implied in the generation (TRPV1, TRPV4, TRPA1) and inhibition (TRPM8) of visceral pain signals. Pathological changes in their functioning have been demonstrated in inflammatory conditions, and appear to be present in IBS as well...
September 8, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28880852/rna-sequencing-uncovers-molecular-mechanisms-underlying-pathological-complete-response-to-chemotherapy-in-patients-with-operable-breast-cancer
#10
Yongfeng Li, Xiaozhen Liu, Hongchao Tang, Hongjian Yang, Xuli Meng
BACKGROUND This study aimed to identify key genes contributing to pathological complete response (pCR) to chemotherapy by mRNA sequencing (RNA-seq). MATERIAL AND METHODS RNA was extracted from the frozen biopsy tissue of patients with pathological complete response and patients with non-pathological complete response. Sequencing was performed on the HiSeq2000 platform. Differentially expressed genes (DEGs) were identified between the pCR group and non-pCR (NpCR) group. Pathway enrichment analysis of DEGs was performed...
September 7, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28877958/proline-dependent-and-basophilic-kinases-phosphorylate-human-trpc6-at-serine-14-to-control-channel-activity-through-increased-membrane-expression
#11
Henning Hagmann, Nicole Mangold, Markus M Rinschen, Tim Koenig, Karl Kunzelmann, Bernhard Schermer, Thomas Benzing, Paul T Brinkkoetter
Signaling via the transient receptor potential (TRP) ion channel C6 plays a pivotal role in hereditary and sporadic glomerular kidney disease. Several studies have identified gain-of-function mutations of TRPC6 and report induced expression and enhanced channel activity of TRPC6 in association with glomerular diseases. Interfering with TRPC6 activity may open novel therapeutic pathways. TRPC6 channel activity is controlled by protein expression and stability as well as intracellular trafficking. Identification of regulatory phosphorylation sites in TRPC6 and corresponding protein kinases is essential to understand the regulation of TRPC6 activity and may result in future therapeutic strategies...
September 6, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28874842/investigation-of-mitochondrial-metabolic-response-to-doxorubicin-in-prostate-cancer-cells-an-nadh-fad-and-tryptophan-flim-assay
#12
Shagufta Rehman Alam, Horst Wallrabe, Zdenek Svindrych, Ajay K Chaudhary, Kathryn G Christopher, Dhyan Chandra, Ammasi Periasamy
Prostate cancer (PCa) is one of the leading cancers in men in the USA. Lack of experimental tools that predict therapy response is one of the limitations of current therapeutic regimens. Mitochondrial dysfunctions including defective oxidative phosphorylation (OXPHOS) in cancer inhibit apoptosis by modulating ROS production and cellular signaling. Thus, correction of mitochondrial dysfunction and induction of apoptosis are promising strategies in cancer treatment. We have used Fluorescence Lifetime Imaging Microscopy (FLIM) to quantify mitochondrial metabolic response in PCa cells by tracking auto-fluorescent NAD(P)H, FAD and tryptophan (Trp) lifetimes and their enzyme-bound fractions as markers, before and after treatment with anti-cancer drug doxorubicin...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28870079/characterizing-residue-bilayer-interactions-using-gramicidin-a-as-a-scaffold-and-tryptophan-substitutions-as-probes
#13
Andrew H Beaven, Alexander J Sodt, Richard Walter Pastor, Roger E Koeppe, Olaf S Andersen, Wonpil Im
Previous experiments have shown that the lifetime of a gramicidin A dimer channel (which forms from two non-conducting monomers) in a lipid bilayer is modulated by mutations of the tryptophan (Trp) residues at the bilayer-water interface. We explore this further using extensive molecular dynamics simulations of various gA dimer and monomer mutants at the Trp positions in phosphatidylcholine bilayers with different tail lengths. gA interactions with the surrounding bilayer are strongly modulated by mutating these Trp residues...
September 4, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28867800/ciguatoxins-evoke-potent-cgrp-release-by-activation-of-voltage-gated-sodium-channel-subtypes-nav1-9-nav1-7-and-nav1-1
#14
Filip Touska, Simon Sattler, Philipp Malsch, Richard J Lewis, Peter W Reeh, Katharina Zimmermann
Ciguatoxins (CTXs) are marine toxins that cause ciguatera fish poisoning, a debilitating disease dominated by sensory and neurological disturbances that include cold allodynia and various painful symptoms as well as long-lasting pruritus. Although CTXs are known as the most potent mammalian sodium channel activator toxins, the etiology of many of its neurosensory symptoms remains unresolved. We recently described that local application of 1 nM Pacific Ciguatoxin-1 (P-CTX-1) into the skin of human subjects induces a long-lasting, painful axon reflex flare and that CTXs are particularly effective in releasing calcitonin-gene related peptide (CGRP) from nerve terminals...
August 30, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28863818/depletion-of-membrane-cholesterol-suppresses-drosophila-transient-receptor-potential-like-trpl-channel-activity
#15
Maximilian Peters, Ben Katz, Shaya Lev, Rachel Zaguri, Rita Gutorov, Baruch Minke
Cholesterol is an essential compound of higher eukaryotic cell membranes and a known modulator of ion channel activity. Changes in phospholipids and cholesterol composition of cell membranes are known to alter the activity of ion channels. However, there is little knowledge on the effects of cholesterol on transient receptor potential (TRP) channels. In this study, we explore the effects of cholesterol depletion on the Drosophila photoreceptor channel TRP-like (TRPL), when expressed in tissue culture cells...
2017: Current Topics in Membranes
https://www.readbyqxmd.com/read/28863814/multiple-mechanisms-of-regulation-of-transient-receptor-potential-ion-channels-by-cholesterol
#16
Sara L Morales-Lázaro, Tamara Rosenbaum
The transient receptor potential (TRP) family of ion channels is constituted by several nonselective cation channels that are activated by diverse stimuli and that function as polymodal receptors. TRP ion channels are expressed in neural and nonneural tissues where they play important roles in cell physiology. The activation of these ion channels is achieved through changes in temperature, osmolarity, voltage, pH, pressure, and by some natural or synthetic chemical compounds that directly bind to these proteins to regulate their activity...
2017: Current Topics in Membranes
https://www.readbyqxmd.com/read/28861042/3-iodothyronamine-a-novel-endogenous-modulator-of-transient-receptor-potential-melastatin-8
#17
REVIEW
Noushafarin Khajavi, Stefan Mergler, Heike Biebermann
The decarboxylated and deiodinated thyroid hormone (TH) derivative, 3-iodothyronamine (3-T1AM), is suggested to be involved in energy metabolism and thermoregulation. G protein-coupled receptors (GPCRs) are known as the main targets for 3-T1AM; however, transient receptor potential channels (TRPs) were also recently identified as new targets of 3-T1AM. This article reviews the current knowledge of a putative novel role of 3-T1AM in the modulation of TRPs. Specifically, the TRP melastatin 8 (TRPM8) was identified as a target of 3-T1AM in different cell types including neoplastic cells, whereby 3-T1AM significantly increased cytosolic Ca(2+) through TRPM8 activation...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28852171/integrative-approach-with-electrophysiological-and-theoretical-methods-reveals-a-new-role-of-s4-positively-charged-residues-in-pkd2l1-channel-voltage-sensing
#18
Tomohiro Numata, Kunichika Tsumoto, Kazunori Yamada, Tatsuki Kurokawa, Shinichi Hirose, Hideki Nomura, Mitsuhiro Kawano, Yoshihisa Kurachi, Ryuji Inoue, Yasuo Mori
Numerical model-based simulations provide important insights into ion channel gating when experimental limitations exist. Here, a novel strategy combining numerical simulations with patch clamp experiments was used to investigate the net positive charges in the putative transmembrane segment 4 (S4) of the atypical, positively-shifted voltage-dependence of polycystic kidney disease 2-like 1 (PKD2L1) channel. Charge-neutralising mutations (K452Q, K455Q and K461Q) in S4 reduced gating charges, positively shifted the Boltzmann-type activation curve [i...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28842627/enhancement-of-mesenchymal-stem-cell-chondrogenesis-with-short-term-low-intensity-pulsed-electromagnetic-fields
#19
Dinesh Parate, Alfredo Franco-Obregón, Jürg Fröhlich, Christian Beyer, Azlina A Abbas, Tunku Kamarul, James H P Hui, Zheng Yang
Pulse electromagnetic fields (PEMFs) have been shown to recruit calcium-signaling cascades common to chondrogenesis. Here we document the effects of specified PEMF parameters over mesenchymal stem cells (MSC) chondrogenic differentiation. MSCs undergoing chondrogenesis are preferentially responsive to an electromagnetic efficacy window defined by field amplitude, duration and frequency of exposure. Contrary to conventional practice of administering prolonged and repetitive exposures to PEMFs, optimal chondrogenic outcome is achieved in response to brief (10 minutes), low intensity (2 mT) exposure to 6 ms bursts of magnetic pulses, at 15 Hz, administered only once at the onset of chondrogenic induction...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28839241/leukocyte-trp-channel-gene-expressions-in%C3%A2-patients-with-non-valvular-atrial-fibrillation
#20
Irfan V Düzen, Fethi Yavuz, Ertan Vuruskan, Erhan Saracoglu, Fatih Poyraz, Hüseyin Göksülük, Basar Candemir, Seniz Demiryürek
Atrial fibrillation (AF) is the most common arrhythmia in clinical practice and is a major cause of morbidity and mortality. The upregulation of TRP channels is believed to mediate the progression of electrical remodelling and the arrhythmogenesis of the diseased heart. However, there is limited data about the contribution of the TRP channels to development of AF. The aim of this study was to investigate leukocyte TRP channels gene expressions in non-valvular atrial fibrillation (NVAF) patients. The study included 47 NVAF patients and 47 sex and age matched controls...
August 24, 2017: Scientific Reports
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